package com.xbjtech.ticketsystem.utils;

import java.security.MessageDigest;

public class MD5Util {

    /***
     * MD5值
     */
    public static String encryptMD5(String inStr) {
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
            return "";
        }
        char[] charArray = inStr.toCharArray();
        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++) {
            byteArray[i] = (byte) charArray[i];
        }
        byte[] md5Bytes = md5.digest(byteArray);
        StringBuffer hexValue = new StringBuffer();
        for (int i = 0; i < md5Bytes.length; i++) {
            int val = ((int) md5Bytes[i]) & 0xff;
            if (val < 16) {
                hexValue.append("0");
            }
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString();

    }

    // 不可逆的MD5 加密
    public static void main(String[] args) {
        String s = "123456";
        System.out.println("加密前：" + s);
        // 生成MD5值
        String encryptResult = encryptMD5(s);
        System.out.println("MD5后：" + encryptResult);
        // 加密
        String decryptResult = encryptMD5(encryptResult);
        System.out.println("MD5后加密：" + decryptResult);
        // 解密
    }
}